GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute

{
  "id": "164a71e5c3ebd3a44844f9ac57f567a81a944b0954dfdcf70d490b3e90047000",
  "url": "https://osv.dev/vulnerability/CVE-2026-41642",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute",
    "summary": "GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP due to a nil pointer dereference. When a malformed BGP UPDATE message contains an unrecognized Path Attribute marked as \"Well-known,\" the daemon fails to interrupt the message handling flow. This results in an illegal memory access and a full process crash (panic). This issue has been patched in version 4.4.0.",
    "evidence": "osv:CVE-2026-41642",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-41642",
      "aliases": [
        "CVE-2026-41642",
        "GHSA-7235-89m6-f4px",
        "GO-2026-5198"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/osrg/gobgp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c3eb0db6df91379e15ce1a8709cb1b64f482248e"
                },
                {
                  "fixed": "12b4ebaef14f61e1c7c7403c770b67826f0b8cf4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "= 4.3.0"
                      },
                      {
                        "last_affected": "= 4.3.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "fixed": "12b4ebaef14f61e1c7c7403c770b67826f0b8cf4"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v4.4.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.3.0",
            "= 4.3.0",
            "v4.3.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41642.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:46.205580482Z",
      "provider": "osv",
      "references": [
        "https://github.com/osrg/gobgp/releases/tag/v4.4.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41642.json",
        "https://github.com/osrg/gobgp/security/advisories/GHSA-7235-89m6-f4px",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-41642"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-476"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41642.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-41642",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514212,
  "published_at": "2026-05-07T11:50:41.545+00:00"
}